Security was high outside the U.S. embassy on Monday, and police searched pedestrians before allowing them to enter a street where the main gate is located

Published at 5:19 AM PST on Mar 5, 2018

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Policemen stand guard outside the United States embassy in Ankara on Monday, March 5, 2018, as part of security measures set after the embassy was closed to the public over a "security threat."

Turkey's state-run media says Turkish police have detained four Islamic State suspects as part of an investigation into a possible attack on the U.S. Embassy in Ankara.

The U.S. Embassy was closed on Monday over an unspecified security threat.

The Anadolu Agency said police detained four suspects on Monday — all of them Iraqi nationals. Two of them were detained on a bus at a security check on a highway linking the Black Sea city of Samsun to Ankara. Two others were detained in Samsun.

Security was high outside the U.S. embassy on Monday, and police searched pedestrians before allowing them to enter a street where the main gate is located.